Question

Find the circumference of the circle. Round to the nearest tenth.

Answer 1

251.3 in

Explanation:

The formula for circumference is π·d

Double 40 to get your radius, 80

Then, multiply π·80

The circumference is about 251.3 in

Answer 2

Formula for the circumference of a circle: C = pi x diameter

We are given the radius here, but we need the diameter. The diameter of a circle is equal to two times the radius.

diameter = 40 x 2 = 80 in

C = pi x 80

C = 80pi = 251.3 in

Hope this helps!! :)